Croatia's Marin Cilic defeated U.S. Andy Roddick ( 7-6 6-3 3-6 2-6 6-3) in their Australian Open quarter-final on Tuesday.
Cilic thus ensured his first grandslam semi-final.
His rival in this semi-final will be the winner of the duel Rafael Nadal -Andy Murray.
Cilic is the first Croatian tennis player to reach an Australian Open semi-final.